fix: /export defaults to JSON, ?format=txt for plain text

src/api/routes/entries.js

@@ -86,7 +86,7 @@ function createEntriesRouter({ q }) {
   });
 
   // GET /api/v1/entries/export — агрегированный список CIDR
-  // ?format=json → JSON, иначе text/plain
+  // По умолчанию JSON. ?format=txt → text/plain.
   // Только для админа.
   router.get('/export', async (req, res) => {
     try {
@@ -105,8 +105,8 @@ function createEntriesRouter({ q }) {
       const cidrs = await q.getExportCIDRs(companyId);
       const aggregated = aggregateCIDRs(cidrs);
 
-      const isJson = req.query.format === 'json';
-      if (isJson) {
+      const isText = req.query.format === 'txt';
+      if (!isText) {
         res.setHeader('Content-Type', 'application/json; charset=utf-8');
         const fname = (req.query.filename || 'white-list.json').replace(/[^\w\-_. ]/g, '_');
         const disp  = req.query.view === '1' ? 'inline' : 'attachment';